LunaCalc
About LunaCalc
LunaCalc is a free online calculator library for everyday math, finance, health, unit conversion, statistics, physics, and other practical tasks. Open a tool, enter the values you know, and get a clear result without creating an account.
Calculator inputs are processed in your browser by default and are not submitted to our server for calculation. The site has no account system, password database, profile page, or server-side history of the values you enter.
The site currently publishes 120 calculators across 14 categories. Each tool has its own page with inputs, related tools, formula notes, worked examples, and frequently asked questions. We continue to add useful calculators and improve existing pages so their assumptions and limits are easier to understand.
LunaCalc is independently maintained. For product feedback, bug reports, content corrections, partnership questions, or privacy requests, contact haytaylorrr@gmail.com. Including the page address and relevant details helps us respond more effectively.
Results are for general reference and learning. They are not a substitute for professional advice in medicine, lending, law, engineering, taxation, or other regulated decisions. Always verify critical numbers before you act on them.
This page is updated when the tool library, privacy practices, or contact channels change. Suggestions for new calculators, corrections to formula notes, and reports of unclear wording in English or Chinese are welcome.